Rename `constant` to `parked` in some places
Rename `constant` to `parked` in some places

chrisballinger/ParkedTextField,tonypham/ParkedTextField,remzr7/ParkedTextField,AbooJan/ParkedTextField,Suninus/ParkedTextField,hoanganh6491/ParkedTextField,zhouwude/ParkedTextField,stoner30/ParkedTextField,chrisballinger/ParkedTextField,AbooJan/ParkedTextField,remzr7/ParkedTextField,AbooJan/ParkedTextField,stoner30/ParkedTextField,zhouwude/ParkedTextField,luzefeng/ParkedTextField,Suninus/ParkedTextField,hoanganh6491/ParkedTextField,hoanganh6491/ParkedTextField,tonypham/ParkedTextField,chrisballinger/ParkedTextField,tonypham/ParkedTextField,Suninus/ParkedTextField,gmertk/ParkedTextField,luzefeng/ParkedTextField,zhouwude/ParkedTextField,luzefeng/ParkedTextField,gmertk/ParkedTextField,stoner30/ParkedTextField